Coated wood panel products must be stacked face to face or face to back during warehousing, packaging, and transportation without the coated finish sticking (blocking) and becoming damaged. This test method describes a laboratory means of evaluating conditions of blocking using factors of pressure, heat, time and moisture.

Degrees of hardness or degrees of cure of organic coatings, or both, can be evaluated using a blocking test.

The rate of volatile loss (drying speed) of organic coatings can be evaluated using a blocking test.

The effectiveness of protective packaging materials (slip sheets) for organic coatings on wood substrates can be evaluated using a blocking test.